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Accounting for Financial Instruments - Summary of Derivatives Not Designated as Hedging Instruments and Embedded Derivatives (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Amount of gain (loss) recognized in other operating income (expense)	CAD 202	CAD 185
Zinc [member]
Disclosure of detailed information about financial instruments [line items]
Amount of gain (loss) recognized in other operating income (expense)	11	45
Lead [member]
Disclosure of detailed information about financial instruments [line items]
Amount of gain (loss) recognized in other operating income (expense)	10	(5)
Settlements Receivable And Payable [member]
Disclosure of detailed information about financial instruments [line items]
Amount of gain (loss) recognized in other operating income (expense)	190	153
Contingent Zinc Escalation Payment Embedded Derivative [member]
Disclosure of detailed information about financial instruments [line items]
Amount of gain (loss) recognized in other operating income (expense)	(24)	(18)
Gold Stream Embedded Derivative [member]
Disclosure of detailed information about financial instruments [line items]
Amount of gain (loss) recognized in other operating income (expense)	13	6
Silver Stream Embedded Derivative [member]
Disclosure of detailed information about financial instruments [line items]
Amount of gain (loss) recognized in other operating income (expense)	CAD 2	CAD 4

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The gains (losses) on financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss, mandatorily measured at fair value; Gains (losses) on financial assets at fair value through profit or loss; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 20
-Subparagraph a
-Clause i
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-URIDate 2017-03-09

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